hi, I have problems with alternate tunings. I break my strings a lot.

What is a good tuner for acoustics.

I want to tackle, Nick Drake, Robert Johnson, I want to learn drunken spree, skip james, the alternate pretty mary k , elliott smith.

I need help. My tuner I own now only tunes half, and full - drop down steps and open D,E,G,A tuning.

I know those tunings are not like the ones these artist use.

What is the best alternate tuning tuner??